These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Himiko is Ban's sister? How does that make sense? Why didn't Der Kaiser mention her? Why doesn't Ban share the same curse as Himiko?
Big Lipped Alligator Moment: It turns out that Himiko is actually Ban's sister but not Yamato's. How is that important? How does that make sense with the flashbacks? In fact nobody ever mentions it again. Sounds like an Ass Pull.
Crazy Awesome: Akabane he cut a dimensional erosion just because he's Akabane, he can manipulate shadows, cannot die, make clones and create weapons out of his blood for this reason
Ensemble Darkhorse: Kuroudo Akabane, who's arguably the most popular and admired character in the series. He tends to fluctuate in polls as being ranked #1 and #2 (with Ban or Ginji occasionally overtaking him depending on which one was getting more character development during that particular time period in the manga's serialization).
And to a certain degree, Juubei Kakei. If only for the trickle-down effect: Ayamine Rando notes that as soon as Toshiki's past was linked to Juubei's, his popularity shot right up.
Yukihiko Miroku despite appearing in one arc, is very popular
Foe Yay: Akabane and Ban/Ginji, no wonder Ginji gets so nervous when he's around. And taken Up to Eleven, there's the one-sided Takuma Fudou and Ban.
Fudou's the human incarnation of it, being almost as bad as Creed.
Harsher in Hindsight: Before the final arc started there was a scene in which Ban saw Himiko in the shower and smiled. Later Ban confesses Himiko is his sister... Oh boy.
They Wasted a Perfectly Good Plot: In the last arc, it brings up a unique element in Exotic Eye Designs with a single cross stigmata eye with a great deal of the major characters including Masaki, Ban's dad and Kazuki, but all that is brought up on it is that those who bare it, have set up "an important destiny".
Also the final arc would have been a great way to resolve all the individual conflicts of the characters but soon becomes a dragged out brawl with a great deal of anti-climatic fights and the revelation of the world being virtual reality